320523330 has 64 divisors (see below), whose sum is σ = 788486400. Its totient is φ = 83356416.

The previous prime is 320523317. The next prime is 320523349. The reversal of 320523330 is 33325023.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 320523297 and 320523306.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 315904 + ... + 316916.

It is an arithmetic number, because the mean of its divisors is an integer number (12320100).

Almost surely, 2^320523330 is an apocalyptic number.

320523330 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 320523330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394243200).

320523330 is an abundant number, since it is smaller than the sum of its proper divisors (467963070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320523330 is a wasteful number, since it uses less digits than its factorization.

320523330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275.

The product of its (nonzero) digits is 1620, while the sum is 21.

The square root of 320523330 is about 17903.1653625832. The cubic root of 320523330 is about 684.3630429720.

Adding to 320523330 its reverse (33325023), we get a palindrome (353848353).

The spelling of 320523330 in words is "three hundred twenty million, five hundred twenty-three thousand, three hundred thirty".